Classification standards for masks

Masks are a kind of sanitary products. Generally, they are worn on the mouth and nose to filter the air entering the mouth and nose to prevent harmful gases, odors, and droplets from entering and leaving the wearer's mouth and nose. They are made of gauze or paper. Masks have a certain filtering effect on the air entering the lungs. When respiratory infectious diseases are prevalent, when working in dust and other polluted environments, wearing masks has a very good effect. 1. Ordinary gauze masks. For civilian use, it belongs to the textile category. ★Gauze masks are not dustproof; ★Ordinary gauze masks are fiber masks. The flow blocking principle is a mechanical barrier. Through this layer of mechanical barrier, large particles can be blocked, but the diameter is smaller than 5 micron particles can't stop; ★ gauze masks are more advanced than other masks, so they are also called gas masks, and their anti-virus and dust-proof effects are better. They are generally used in dust-producing factories and some dangerous rescues. 2. Medical masks. Medical masks consist of a mask body and a tension band. The mask body is divided into inner, middle and outer layers. The inner layer is made of skin-friendly material (ordinary sanitary gauze or non-woven fabric), and the middle layer is the isolation filter layer ( Ultra-fine polypropylene fiber melt-blown material layer), the outer layer is a special material antibacterial layer (non-woven fabric or ultra-thin polypropylene melt-blown material layer). According to performance characteristics and scope of application, medical masks can be divided into: medical protective masks, medical surgical masks, and ordinary medical masks. ★Medical protective masks: Medical protective masks are suitable for medical staff and related staff to protect against airborne respiratory infectious diseases. It is a kind of close-fitting self-priming filtering medical protective equipment with high protection level, especially suitable for diagnosis and treatment activities. Wear it when you are in contact with patients with respiratory tract infections that are transmitted through the air or through droplets at close range. It can filter particles in the air and block droplets, blood, body fluids, secretions, etc. It is a disposable product. Medical protective masks can prevent most pathogens such as bacteria and viruses. The WHO recommends that medical staff use protective masks against particulates to prevent virus infection in the hospital air. ★Medical surgical masks: Medical surgical masks are suitable for basic protection of medical staff or related personnel, as well as protection against the spread of blood, body fluids and splashes during invasive operations. The protection level is medium and has certain respiratory protection performance. It is mainly worn in a clean environment with a cleanliness level of 100,000 or less, working in an operating room, nursing patients with immunocompromised function, and performing body cavity puncture operations. Medical surgical masks can block most bacteria and some viruses, prevent medical staff from being infected, and at the same time prevent the direct discharge of microorganisms carried in the breath of medical staff, posing a threat to patients undergoing surgery. Medical surgical masks require a filtration efficiency of more than 95% for bacteria. Disposable medical surgical masks should also be issued to suspicious respiratory patients to prevent the threat of infection to other hospital personnel and reduce the risk of cross-infection, but the effectiveness of preventing infection is not as good as medical protective masks. ★Ordinary medical masks: Ordinary medical masks are used to block splashes from the oral cavity and nasal cavity, and can be used for one-time hygiene care in ordinary medical environments with the lowest level of protection. It is suitable for general health care activities, such as sanitation, liquid preparation, bed cleaning, etc., or the barrier or protection of particles other than pathogenic microorganisms such as pollen. 3. Daily-use protective masks are mainly used to prevent smog. 4. Dust masks and oily fume masks (scientific name: self-priming filter anti-particulate respirator) are generally used for occupational protection. It has better anti-smog effect. ★Dust-proof masks are mainly used to prevent dust, smoke, fog, microorganisms, etc. Divided into KN100, KN95 and KN90 grades. Among them, KN100 grade can effectively prevent the ultrafine dust rate of more than 99.97%. ★Anti-oil fume masks, mainly against oil fume and oil mist, but also against dust, smoke, fog, microorganisms, etc. Divided into KP100, KP95 and KP90 grades. Among them, KP100 grade can effectively prevent the ultrafine dust rate of more than 99.97%. ★According to the mask style, it can be divided into three types: disposable, duplex half-face mask and full face mask.